# A module is simply a python file (with .py extension)

# A module is imported by using import keyword

# Modules are loaded only once and initialized only once

# i.e. if the other module imports the same module, it will not be initialized again

#

# so local variables inside the module act as a "singleton" - they are initialized only once.

import urllib

import mymodule

import mymodule2

connection = urllib.urlopen("http://www.learnpython.org/en/Modules_and_Packages")

#print "result = " + str(connection.info())

print "result code = "+str(connection.geturl())

# To make your own module, you just need to create a file with the module name

# To import the module, just use import command and filename without the extension

# To use the functions in the module, use <modulename>.<functionname>

print "Magic number in the module: %d" % mymodule.magic_number

print mymodule.add(3,4)

print mymodule.subtract(3,4)

print mymodule.divide(3,4)

print mymodule.multiply(3,4)

# You can import one module inside the other

from mymodule2 import average

# mymodule2 loads mymodule. But we'd expect that mymodule is loaded only once.

# this should NOT print 2

print "Magic number in the module: %d" % mymodule.magic_number

list = [1,2,5,7,8,10,15, -3]

x = mymodule2.average(list)

print x

# Exercise

# In this exercise, you will need to print an alphabetically sorted list of all functions in the re module,

# which contain the word find.

import re

#import dir

function_list = dir(re)

for function in function_list :

print function